The place where the telescope is situated needs to be carefully chosen.Gamma rays and X-rays
are absorbed by the Earth's
atmosphere
and do not reach the Earth's
surface.Telescopes receiving Gamma
rays and X-rays must be in space.

Other regions of the electromagneticspectrum
are also affected by the Earth's atmosphere.

The Hubble
telescope is in space because
it receives clearerimagesoutside of the Earth's
atmosphere
than other visible lighttelescopes
on the Earth's surface.
The image at the Earth's
surface can be blurred
(by dust and pollution
in the atmosphere)
and less distinct because of other sources
of light
from streetlights, towns
and cities (called light
pollution).

The SPT (South
Pole Telescope) is in Antarctica which is verydry(and cold)
because it receives microwaves which would
be
absorbed
by water molecules in the Earth's
atmosphere.

The information gained by modern
telescopes have helped our
understanding of what the Universe is,
and what it is made from.Improvements in the magnification
of telescopeshave led to newstars
and galaxies being seen
for the first time.
Also objects in the Universe
which can not be seenwith visible light
can now be detected.